2-Butenoic acid, 4-[(2-hydroxy-5-oxo-1-cyclopenten-1-yl)amino]-4-oxo-, 6-ethyltetrahydro-2-hydroxy-2-[2-hydroxy-3-(10-hydroxy-3-methoxy-7,9,1 1,13,15-pentamethyl-16-oxooxacyclohexadeca-4,6,12,14-tet